Search Publications
Alma Observations of Massive Molecular Gas Filaments Encasing Radio Bubbles in the Phoenix Cluster
Bayliss, M. B.; Fabian, A. C.; Hlavacek-Larrondo, J. +11 more
We report new ALMA observations of the CO(3-2) line emission from the 2.1+/- 0.3× {10}10 {M}⊙ molecular gas reservoir in the central galaxy of the Phoenix cluster. The cold molecular gas is fueling a vigorous starburst at a rate of 500{--}800 {M}⊙ {{yr}}-1 and powerful black hole activity in the forms …
The MOSDEF Survey: AGN Multi-wavelength Identification, Selection Biases, and Host Galaxy Properties
Siana, Brian; Azadi, Mojegan; Aird, James +10 more
We present results from the MOSFIRE Deep Evolution Field (MOSDEF) survey on the identification, selection biases, and host galaxy properties of 55 X-ray, IR, and optically selected active galactic nuclei (AGNs) at 1.4< z< 3.8. We obtain rest-frame optical spectra of galaxies and AGNs and use the BPT diagram to identify optical AGNs. We exami…
SPIRITS: Uncovering Unusual Infrared Transients with Spitzer
Van Dyk, Schuyler D.; Tinyanont, Samaporn; Smith, Nathan +44 more
We present an ongoing, five-year systematic search for extragalactic infrared transients, dubbed SPIRITS—SPitzer InfraRed Intensive Transients Survey. In the first year, using Spitzer/IRAC, we searched 190 nearby galaxies with cadence baselines of one month and six months. We discovered over 1958 variables and 43 transients. Here, we describe the …
Living on a Flare: Relativistic Reflection in V404 Cyg Observed by NuSTAR during Its Summer 2015 Outburst
Harrison, F. A.; Stern, D.; Fabian, A. C. +19 more
We present first results from a series of NuSTAR observations of the black hole X-ray binary V404 Cyg obtained during its summer 2015 outburst, primarily focusing on observations during the height of this outburst activity. The NuSTAR data show extreme variability in both the flux and spectral properties of the source. This is partly driven by str…
The ISLAndS Project. II. The Lifetime Star Formation Histories of Six Andomeda dSphS
Ferguson, Henry C.; McQuinn, Kristen B. W.; Dolphin, Andrew E. +17 more
The Initial Star formation and Lifetimes of Andromeda Satellites (ISLAndS) project employs Hubble Space Telescope imaging to study a representative sample of six Andromeda dSph satellite companion galaxies. Our main goal is to determine whether the star formation histories (SFHs) of the Andromeda dSph satellites demonstrate significant statistical…
Improved Dynamical Constraints on the Mass of the Central Black Hole in NGC 404
Williams, Benjamin F.; Caldwell, Nelson; Neumayer, Nadine +6 more
We explore the nucleus of the nearby 109 {M}⊙ early-type galaxy, NGC 404, using Hubble Space Telescope (HST)/STIS spectroscopy and WFC3 imaging. We first present evidence for nuclear variability in UV, optical, and infrared filters over a time period of 15 years. This variability adds to the already substantial evidence for …
A Complete ALMA Map of the Fomalhaut Debris Disk
MacGregor, Meredith A.; Hughes, A. Meredith; Kalas, Paul +14 more
We present ALMA mosaic observations at 1.3 mm (223 GHz) of the Fomalhaut system with a sensitivity of 14 µJy/beam. These observations provide the first millimeter map of the continuum dust emission from the complete outer debris disk with uniform sensitivity, enabling the first conclusive detection of apocenter glow. We adopt an MCMC modelin…
The Tip of the Red Giant Branch Distances to Typa Ia Supernova Host Galaxies. V. NGC 3021, NGC 3370, and NGC 1309 and the Value of the Hubble Constant
Lee, Myung Gyoon; Jang, In Sung
We present final results of a program for the determination of the Hubble constant based on the calibration of the Type Ia supernovae (SNe Ia) using the Tip of the Red Giant Branch (TRGB). We report TRGB distances to three SN Ia host galaxies, NGC 3021, NGC 3370, and NGC 1309. We obtain F555W and F814W photometry of resolved stars from the archiva…
Occurrence of Radio Minihalos in a Mass-limited Sample of Galaxy Clusters
Clarke, Tracy E.; Giacintucci, Simona; Venturi, Tiziana +3 more
We investigate the occurrence of radio minihalos—diffuse radio sources of unknown origin observed in the cores of some galaxy clusters—in a statistical sample of 58 clusters drawn from the Planck Sunyaev-Zel’dovich cluster catalog using a mass cut (M 500 > 6 × 1014 M ⊙). We supplement our statistical sample with…
ALMA [C II] 158 µm Detection of a Redshift 7 Lensed Galaxy behind RXJ1347.1-1145
Carilli, Chris; Fontana, Adriano; Treu, Tommaso +14 more
We present the results of ALMA spectroscopic follow-up of a z = 6.766 Lyα emitting galaxy behind the cluster RX J1347.1-1145. We report the detection of [C II] 158 µm line fully consistent with the Lyα redshift and with the peak of the optical emission. Given the magnification of µ = 5.0 ± 0.3, the intrinsic (corrected for lensing) lum…